Isolation of Bursa of fabricius from chicken - Contamination rate is very high during the isolation. (Jul/25/2011 )

Attempts to isolate primary cells from the bursa of Fabricius failed due to high event of contamination .
Any suggestion or creative ways to avoid the contamination will be very much appreciated.
Thank you

-Alvolo-

A stupid troubleshooting tip: make sure the tools you are using are properly sanitized before you begin your harvest. Glass bead sterilizer, autoclave etc.